"Welcome to the world sweet Stella!" Mack captioned the heartwarming Instagram album above (which features the newborn front and center). "Stella Rhea Edwards came on her own time and surprised us New Years Day! What a way to start our year! We are so in love with her already."

Ryan and Mack memorably revealed during the Teen Mom OG finale to his parents Jen and Larry that their clan would be getting bigger in the not-so-distant future.

"Mack went to the doctor, and she's pregnant," Ryan told his folks. Jen had a priceless reaction to her grandchild-on-the-way, with a big "what?!"

Offer your congrats to the Edwards family -- and stay with MTV News for more Teen Mom OG programming updates!

- Jordana Ossad.

Main Image Credit: Instagram, @mackedwards95

PICS: Check Out All Of The V Cute Moments From The Teen Mom Australia Launch...

PICS: Check Out All Of The V Cute Moments From The Teen Mom Australia Launch

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